source: src/linux/universal/linux-3.18/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 4 months ago

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1/**************************************************************************
2 *
3 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include "vmwgfx_drv.h"
29#include <drm/vmwgfx_drm.h>
30#include <drm/ttm/ttm_object.h>
31#include <drm/ttm/ttm_placement.h>
32#include <drm/drmP.h>
33#include "vmwgfx_resource_priv.h"
34
35#define VMW_RES_EVICT_ERR_COUNT 10
36
37struct vmw_user_dma_buffer {
38        struct ttm_prime_object prime;
39        struct vmw_dma_buffer dma;
40};
41
42struct vmw_bo_user_rep {
43        uint32_t handle;
44        uint64_t map_handle;
45};
46
47struct vmw_stream {
48        struct vmw_resource res;
49        uint32_t stream_id;
50};
51
52struct vmw_user_stream {
53        struct ttm_base_object base;
54        struct vmw_stream stream;
55};
56
57
58static uint64_t vmw_user_stream_size;
59
60static const struct vmw_res_func vmw_stream_func = {
61        .res_type = vmw_res_stream,
62        .needs_backup = false,
63        .may_evict = false,
64        .type_name = "video streams",
65        .backup_placement = NULL,
66        .create = NULL,
67        .destroy = NULL,
68        .bind = NULL,
69        .unbind = NULL
70};
71
72static inline struct vmw_dma_buffer *
73vmw_dma_buffer(struct ttm_buffer_object *bo)
74{
75        return container_of(bo, struct vmw_dma_buffer, base);
76}
77
78static inline struct vmw_user_dma_buffer *
79vmw_user_dma_buffer(struct ttm_buffer_object *bo)
80{
81        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
82        return container_of(vmw_bo, struct vmw_user_dma_buffer, dma);
83}
84
85struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
86{
87        kref_get(&res->kref);
88        return res;
89}
90
91struct vmw_resource *
92vmw_resource_reference_unless_doomed(struct vmw_resource *res)
93{
94        return kref_get_unless_zero(&res->kref) ? res : NULL;
95}
96
97/**
98 * vmw_resource_release_id - release a resource id to the id manager.
99 *
100 * @res: Pointer to the resource.
101 *
102 * Release the resource id to the resource id manager and set it to -1
103 */
104void vmw_resource_release_id(struct vmw_resource *res)
105{
106        struct vmw_private *dev_priv = res->dev_priv;
107        struct idr *idr = &dev_priv->res_idr[res->func->res_type];
108
109        write_lock(&dev_priv->resource_lock);
110        if (res->id != -1)
111                idr_remove(idr, res->id);
112        res->id = -1;
113        write_unlock(&dev_priv->resource_lock);
114}
115
116static void vmw_resource_release(struct kref *kref)
117{
118        struct vmw_resource *res =
119            container_of(kref, struct vmw_resource, kref);
120        struct vmw_private *dev_priv = res->dev_priv;
121        int id;
122        struct idr *idr = &dev_priv->res_idr[res->func->res_type];
123
124        res->avail = false;
125        list_del_init(&res->lru_head);
126        write_unlock(&dev_priv->resource_lock);
127        if (res->backup) {
128                struct ttm_buffer_object *bo = &res->backup->base;
129
130                ttm_bo_reserve(bo, false, false, false, NULL);
131                if (!list_empty(&res->mob_head) &&
132                    res->func->unbind != NULL) {
133                        struct ttm_validate_buffer val_buf;
134
135                        val_buf.bo = bo;
136                        val_buf.shared = false;
137                        res->func->unbind(res, false, &val_buf);
138                }
139                res->backup_dirty = false;
140                list_del_init(&res->mob_head);
141                ttm_bo_unreserve(bo);
142                vmw_dmabuf_unreference(&res->backup);
143        }
144
145        if (likely(res->hw_destroy != NULL)) {
146                res->hw_destroy(res);
147                mutex_lock(&dev_priv->binding_mutex);
148                vmw_context_binding_res_list_kill(&res->binding_head);
149                mutex_unlock(&dev_priv->binding_mutex);
150        }
151
152        id = res->id;
153        if (res->res_free != NULL)
154                res->res_free(res);
155        else
156                kfree(res);
157
158        write_lock(&dev_priv->resource_lock);
159
160        if (id != -1)
161                idr_remove(idr, id);
162}
163
164void vmw_resource_unreference(struct vmw_resource **p_res)
165{
166        struct vmw_resource *res = *p_res;
167        struct vmw_private *dev_priv = res->dev_priv;
168
169        *p_res = NULL;
170        write_lock(&dev_priv->resource_lock);
171        kref_put(&res->kref, vmw_resource_release);
172        write_unlock(&dev_priv->resource_lock);
173}
174
175
176/**
177 * vmw_resource_alloc_id - release a resource id to the id manager.
178 *
179 * @res: Pointer to the resource.
180 *
181 * Allocate the lowest free resource from the resource manager, and set
182 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
183 */
184int vmw_resource_alloc_id(struct vmw_resource *res)
185{
186        struct vmw_private *dev_priv = res->dev_priv;
187        int ret;
188        struct idr *idr = &dev_priv->res_idr[res->func->res_type];
189
190        BUG_ON(res->id != -1);
191
192        idr_preload(GFP_KERNEL);
193        write_lock(&dev_priv->resource_lock);
194
195        ret = idr_alloc(idr, res, 1, 0, GFP_NOWAIT);
196        if (ret >= 0)
197                res->id = ret;
198
199        write_unlock(&dev_priv->resource_lock);
200        idr_preload_end();
201        return ret < 0 ? ret : 0;
202}
203
204/**
205 * vmw_resource_init - initialize a struct vmw_resource
206 *
207 * @dev_priv:       Pointer to a device private struct.
208 * @res:            The struct vmw_resource to initialize.
209 * @obj_type:       Resource object type.
210 * @delay_id:       Boolean whether to defer device id allocation until
211 *                  the first validation.
212 * @res_free:       Resource destructor.
213 * @func:           Resource function table.
214 */
215int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
216                      bool delay_id,
217                      void (*res_free) (struct vmw_resource *res),
218                      const struct vmw_res_func *func)
219{
220        kref_init(&res->kref);
221        res->hw_destroy = NULL;
222        res->res_free = res_free;
223        res->avail = false;
224        res->dev_priv = dev_priv;
225        res->func = func;
226        INIT_LIST_HEAD(&res->lru_head);
227        INIT_LIST_HEAD(&res->mob_head);
228        INIT_LIST_HEAD(&res->binding_head);
229        res->id = -1;
230        res->backup = NULL;
231        res->backup_offset = 0;
232        res->backup_dirty = false;
233        res->res_dirty = false;
234        if (delay_id)
235                return 0;
236        else
237                return vmw_resource_alloc_id(res);
238}
239
240/**
241 * vmw_resource_activate
242 *
243 * @res:        Pointer to the newly created resource
244 * @hw_destroy: Destroy function. NULL if none.
245 *
246 * Activate a resource after the hardware has been made aware of it.
247 * Set tye destroy function to @destroy. Typically this frees the
248 * resource and destroys the hardware resources associated with it.
249 * Activate basically means that the function vmw_resource_lookup will
250 * find it.
251 */
252void vmw_resource_activate(struct vmw_resource *res,
253                           void (*hw_destroy) (struct vmw_resource *))
254{
255        struct vmw_private *dev_priv = res->dev_priv;
256
257        write_lock(&dev_priv->resource_lock);
258        res->avail = true;
259        res->hw_destroy = hw_destroy;
260        write_unlock(&dev_priv->resource_lock);
261}
262
263struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
264                                         struct idr *idr, int id)
265{
266        struct vmw_resource *res;
267
268        read_lock(&dev_priv->resource_lock);
269        res = idr_find(idr, id);
270        if (res && res->avail)
271                kref_get(&res->kref);
272        else
273                res = NULL;
274        read_unlock(&dev_priv->resource_lock);
275
276        if (unlikely(res == NULL))
277                return NULL;
278
279        return res;
280}
281
282/**
283 * vmw_user_resource_lookup_handle - lookup a struct resource from a
284 * TTM user-space handle and perform basic type checks
285 *
286 * @dev_priv:     Pointer to a device private struct
287 * @tfile:        Pointer to a struct ttm_object_file identifying the caller
288 * @handle:       The TTM user-space handle
289 * @converter:    Pointer to an object describing the resource type
290 * @p_res:        On successful return the location pointed to will contain
291 *                a pointer to a refcounted struct vmw_resource.
292 *
293 * If the handle can't be found or is associated with an incorrect resource
294 * type, -EINVAL will be returned.
295 */
296int vmw_user_resource_lookup_handle(struct vmw_private *dev_priv,
297                                    struct ttm_object_file *tfile,
298                                    uint32_t handle,
299                                    const struct vmw_user_resource_conv
300                                    *converter,
301                                    struct vmw_resource **p_res)
302{
303        struct ttm_base_object *base;
304        struct vmw_resource *res;
305        int ret = -EINVAL;
306
307        base = ttm_base_object_lookup(tfile, handle);
308        if (unlikely(base == NULL))
309                return -EINVAL;
310
311        if (unlikely(ttm_base_object_type(base) != converter->object_type))
312                goto out_bad_resource;
313
314        res = converter->base_obj_to_res(base);
315
316        read_lock(&dev_priv->resource_lock);
317        if (!res->avail || res->res_free != converter->res_free) {
318                read_unlock(&dev_priv->resource_lock);
319                goto out_bad_resource;
320        }
321
322        kref_get(&res->kref);
323        read_unlock(&dev_priv->resource_lock);
324
325        *p_res = res;
326        ret = 0;
327
328out_bad_resource:
329        ttm_base_object_unref(&base);
330
331        return ret;
332}
333
334/**
335 * Helper function that looks either a surface or dmabuf.
336 *
337 * The pointer this pointed at by out_surf and out_buf needs to be null.
338 */
339int vmw_user_lookup_handle(struct vmw_private *dev_priv,
340                           struct ttm_object_file *tfile,
341                           uint32_t handle,
342                           struct vmw_surface **out_surf,
343                           struct vmw_dma_buffer **out_buf)
344{
345        struct vmw_resource *res;
346        int ret;
347
348        BUG_ON(*out_surf || *out_buf);
349
350        ret = vmw_user_resource_lookup_handle(dev_priv, tfile, handle,
351                                              user_surface_converter,
352                                              &res);
353        if (!ret) {
354                *out_surf = vmw_res_to_srf(res);
355                return 0;
356        }
357
358        *out_surf = NULL;
359        ret = vmw_user_dmabuf_lookup(tfile, handle, out_buf);
360        return ret;
361}
362
363/**
364 * Buffer management.
365 */
366
367/**
368 * vmw_dmabuf_acc_size - Calculate the pinned memory usage of buffers
369 *
370 * @dev_priv: Pointer to a struct vmw_private identifying the device.
371 * @size: The requested buffer size.
372 * @user: Whether this is an ordinary dma buffer or a user dma buffer.
373 */
374static size_t vmw_dmabuf_acc_size(struct vmw_private *dev_priv, size_t size,
375                                  bool user)
376{
377        static size_t struct_size, user_struct_size;
378        size_t num_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
379        size_t page_array_size = ttm_round_pot(num_pages * sizeof(void *));
380
381        if (unlikely(struct_size == 0)) {
382                size_t backend_size = ttm_round_pot(vmw_tt_size);
383
384                struct_size = backend_size +
385                        ttm_round_pot(sizeof(struct vmw_dma_buffer));
386                user_struct_size = backend_size +
387                        ttm_round_pot(sizeof(struct vmw_user_dma_buffer));
388        }
389
390        if (dev_priv->map_mode == vmw_dma_alloc_coherent)
391                page_array_size +=
392                        ttm_round_pot(num_pages * sizeof(dma_addr_t));
393
394        return ((user) ? user_struct_size : struct_size) +
395                page_array_size;
396}
397
398void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
399{
400        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
401
402        kfree(vmw_bo);
403}
404
405static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
406{
407        struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
408
409        ttm_prime_object_kfree(vmw_user_bo, prime);
410}
411
412int vmw_dmabuf_init(struct vmw_private *dev_priv,
413                    struct vmw_dma_buffer *vmw_bo,
414                    size_t size, struct ttm_placement *placement,
415                    bool interruptible,
416                    void (*bo_free) (struct ttm_buffer_object *bo))
417{
418        struct ttm_bo_device *bdev = &dev_priv->bdev;
419        size_t acc_size;
420        int ret;
421        bool user = (bo_free == &vmw_user_dmabuf_destroy);
422
423        BUG_ON(!bo_free && (!user && (bo_free != vmw_dmabuf_bo_free)));
424
425        acc_size = vmw_dmabuf_acc_size(dev_priv, size, user);
426        memset(vmw_bo, 0, sizeof(*vmw_bo));
427
428        INIT_LIST_HEAD(&vmw_bo->res_list);
429
430        ret = ttm_bo_init(bdev, &vmw_bo->base, size,
431                          ttm_bo_type_device, placement,
432                          0, interruptible,
433                          NULL, acc_size, NULL, NULL, bo_free);
434        return ret;
435}
436
437static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
438{
439        struct vmw_user_dma_buffer *vmw_user_bo;
440        struct ttm_base_object *base = *p_base;
441        struct ttm_buffer_object *bo;
442
443        *p_base = NULL;
444
445        if (unlikely(base == NULL))
446                return;
447
448        vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
449                                   prime.base);
450        bo = &vmw_user_bo->dma.base;
451        ttm_bo_unref(&bo);
452}
453
454static void vmw_user_dmabuf_ref_obj_release(struct ttm_base_object *base,
455                                            enum ttm_ref_type ref_type)
456{
457        struct vmw_user_dma_buffer *user_bo;
458        user_bo = container_of(base, struct vmw_user_dma_buffer, prime.base);
459
460        switch (ref_type) {
461        case TTM_REF_SYNCCPU_WRITE:
462                ttm_bo_synccpu_write_release(&user_bo->dma.base);
463                break;
464        default:
465                BUG();
466        }
467}
468
469/**
470 * vmw_user_dmabuf_alloc - Allocate a user dma buffer
471 *
472 * @dev_priv: Pointer to a struct device private.
473 * @tfile: Pointer to a struct ttm_object_file on which to register the user
474 * object.
475 * @size: Size of the dma buffer.
476 * @shareable: Boolean whether the buffer is shareable with other open files.
477 * @handle: Pointer to where the handle value should be assigned.
478 * @p_dma_buf: Pointer to where the refcounted struct vmw_dma_buffer pointer
479 * should be assigned.
480 */
481int vmw_user_dmabuf_alloc(struct vmw_private *dev_priv,
482                          struct ttm_object_file *tfile,
483                          uint32_t size,
484                          bool shareable,
485                          uint32_t *handle,
486                          struct vmw_dma_buffer **p_dma_buf)
487{
488        struct vmw_user_dma_buffer *user_bo;
489        struct ttm_buffer_object *tmp;
490        int ret;
491
492        user_bo = kzalloc(sizeof(*user_bo), GFP_KERNEL);
493        if (unlikely(user_bo == NULL)) {
494                DRM_ERROR("Failed to allocate a buffer.\n");
495                return -ENOMEM;
496        }
497
498        ret = vmw_dmabuf_init(dev_priv, &user_bo->dma, size,
499                              (dev_priv->has_mob) ?
500                              &vmw_sys_placement :
501                              &vmw_vram_sys_placement, true,
502                              &vmw_user_dmabuf_destroy);
503        if (unlikely(ret != 0))
504                return ret;
505
506        tmp = ttm_bo_reference(&user_bo->dma.base);
507        ret = ttm_prime_object_init(tfile,
508                                    size,
509                                    &user_bo->prime,
510                                    shareable,
511                                    ttm_buffer_type,
512                                    &vmw_user_dmabuf_release,
513                                    &vmw_user_dmabuf_ref_obj_release);
514        if (unlikely(ret != 0)) {
515                ttm_bo_unref(&tmp);
516                goto out_no_base_object;
517        }
518
519        *p_dma_buf = &user_bo->dma;
520        *handle = user_bo->prime.base.hash.key;
521
522out_no_base_object:
523        return ret;
524}
525
526/**
527 * vmw_user_dmabuf_verify_access - verify access permissions on this
528 * buffer object.
529 *
530 * @bo: Pointer to the buffer object being accessed
531 * @tfile: Identifying the caller.
532 */
533int vmw_user_dmabuf_verify_access(struct ttm_buffer_object *bo,
534                                  struct ttm_object_file *tfile)
535{
536        struct vmw_user_dma_buffer *vmw_user_bo;
537
538        if (unlikely(bo->destroy != vmw_user_dmabuf_destroy))
539                return -EPERM;
540
541        vmw_user_bo = vmw_user_dma_buffer(bo);
542
543        /* Check that the caller has opened the object. */
544        if (likely(ttm_ref_object_exists(tfile, &vmw_user_bo->prime.base)))
545                return 0;
546
547        DRM_ERROR("Could not grant buffer access.\n");
548        return -EPERM;
549}
550
551/**
552 * vmw_user_dmabuf_synccpu_grab - Grab a struct vmw_user_dma_buffer for cpu
553 * access, idling previous GPU operations on the buffer and optionally
554 * blocking it for further command submissions.
555 *
556 * @user_bo: Pointer to the buffer object being grabbed for CPU access
557 * @tfile: Identifying the caller.
558 * @flags: Flags indicating how the grab should be performed.
559 *
560 * A blocking grab will be automatically released when @tfile is closed.
561 */
562static int vmw_user_dmabuf_synccpu_grab(struct vmw_user_dma_buffer *user_bo,
563                                        struct ttm_object_file *tfile,
564                                        uint32_t flags)
565{
566        struct ttm_buffer_object *bo = &user_bo->dma.base;
567        bool existed;
568        int ret;
569
570        if (flags & drm_vmw_synccpu_allow_cs) {
571                bool nonblock = !!(flags & drm_vmw_synccpu_dontblock);
572                long lret;
573
574                if (nonblock)
575                        return reservation_object_test_signaled_rcu(bo->resv, true) ? 0 : -EBUSY;
576
577                lret = reservation_object_wait_timeout_rcu(bo->resv, true, true, MAX_SCHEDULE_TIMEOUT);
578                if (!lret)
579                        return -EBUSY;
580                else if (lret < 0)
581                        return lret;
582                return 0;
583        }
584
585        ret = ttm_bo_synccpu_write_grab
586                (bo, !!(flags & drm_vmw_synccpu_dontblock));
587        if (unlikely(ret != 0))
588                return ret;
589
590        ret = ttm_ref_object_add(tfile, &user_bo->prime.base,
591                                 TTM_REF_SYNCCPU_WRITE, &existed, false);
592        if (ret != 0 || existed)
593                ttm_bo_synccpu_write_release(&user_bo->dma.base);
594
595        return ret;
596}
597
598/**
599 * vmw_user_dmabuf_synccpu_release - Release a previous grab for CPU access,
600 * and unblock command submission on the buffer if blocked.
601 *
602 * @handle: Handle identifying the buffer object.
603 * @tfile: Identifying the caller.
604 * @flags: Flags indicating the type of release.
605 */
606static int vmw_user_dmabuf_synccpu_release(uint32_t handle,
607                                           struct ttm_object_file *tfile,
608                                           uint32_t flags)
609{
610        if (!(flags & drm_vmw_synccpu_allow_cs))
611                return ttm_ref_object_base_unref(tfile, handle,
612                                                 TTM_REF_SYNCCPU_WRITE);
613
614        return 0;
615}
616
617/**
618 * vmw_user_dmabuf_synccpu_release - ioctl function implementing the synccpu
619 * functionality.
620 *
621 * @dev: Identifies the drm device.
622 * @data: Pointer to the ioctl argument.
623 * @file_priv: Identifies the caller.
624 *
625 * This function checks the ioctl arguments for validity and calls the
626 * relevant synccpu functions.
627 */
628int vmw_user_dmabuf_synccpu_ioctl(struct drm_device *dev, void *data,
629                                  struct drm_file *file_priv)
630{
631        struct drm_vmw_synccpu_arg *arg =
632                (struct drm_vmw_synccpu_arg *) data;
633        struct vmw_dma_buffer *dma_buf;
634        struct vmw_user_dma_buffer *user_bo;
635        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
636        int ret;
637
638        if ((arg->flags & (drm_vmw_synccpu_read | drm_vmw_synccpu_write)) == 0
639            || (arg->flags & ~(drm_vmw_synccpu_read | drm_vmw_synccpu_write |
640                               drm_vmw_synccpu_dontblock |
641                               drm_vmw_synccpu_allow_cs)) != 0) {
642                DRM_ERROR("Illegal synccpu flags.\n");
643                return -EINVAL;
644        }
645
646        switch (arg->op) {
647        case drm_vmw_synccpu_grab:
648                ret = vmw_user_dmabuf_lookup(tfile, arg->handle, &dma_buf);
649                if (unlikely(ret != 0))
650                        return ret;
651
652                user_bo = container_of(dma_buf, struct vmw_user_dma_buffer,
653                                       dma);
654                ret = vmw_user_dmabuf_synccpu_grab(user_bo, tfile, arg->flags);
655                vmw_dmabuf_unreference(&dma_buf);
656                if (unlikely(ret != 0 && ret != -ERESTARTSYS &&
657                             ret != -EBUSY)) {
658                        DRM_ERROR("Failed synccpu grab on handle 0x%08x.\n",
659                                  (unsigned int) arg->handle);
660                        return ret;
661                }
662                break;
663        case drm_vmw_synccpu_release:
664                ret = vmw_user_dmabuf_synccpu_release(arg->handle, tfile,
665                                                      arg->flags);
666                if (unlikely(ret != 0)) {
667                        DRM_ERROR("Failed synccpu release on handle 0x%08x.\n",
668                                  (unsigned int) arg->handle);
669                        return ret;
670                }
671                break;
672        default:
673                DRM_ERROR("Invalid synccpu operation.\n");
674                return -EINVAL;
675        }
676
677        return 0;
678}
679
680int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
681                           struct drm_file *file_priv)
682{
683        struct vmw_private *dev_priv = vmw_priv(dev);
684        union drm_vmw_alloc_dmabuf_arg *arg =
685            (union drm_vmw_alloc_dmabuf_arg *)data;
686        struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
687        struct drm_vmw_dmabuf_rep *rep = &arg->rep;
688        struct vmw_dma_buffer *dma_buf;
689        uint32_t handle;
690        int ret;
691
692        ret = ttm_read_lock(&dev_priv->reservation_sem, true);
693        if (unlikely(ret != 0))
694                return ret;
695
696        ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
697                                    req->size, false, &handle, &dma_buf);
698        if (unlikely(ret != 0))
699                goto out_no_dmabuf;
700
701        rep->handle = handle;
702        rep->map_handle = drm_vma_node_offset_addr(&dma_buf->base.vma_node);
703        rep->cur_gmr_id = handle;
704        rep->cur_gmr_offset = 0;
705
706        vmw_dmabuf_unreference(&dma_buf);
707
708out_no_dmabuf:
709        ttm_read_unlock(&dev_priv->reservation_sem);
710
711        return ret;
712}
713
714int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
715                           struct drm_file *file_priv)
716{
717        struct drm_vmw_unref_dmabuf_arg *arg =
718            (struct drm_vmw_unref_dmabuf_arg *)data;
719
720        return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
721                                         arg->handle,
722                                         TTM_REF_USAGE);
723}
724
725int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
726                           uint32_t handle, struct vmw_dma_buffer **out)
727{
728        struct vmw_user_dma_buffer *vmw_user_bo;
729        struct ttm_base_object *base;
730
731        base = ttm_base_object_lookup(tfile, handle);
732        if (unlikely(base == NULL)) {
733                printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
734                       (unsigned long)handle);
735                return -ESRCH;
736        }
737
738        if (unlikely(ttm_base_object_type(base) != ttm_buffer_type)) {
739                ttm_base_object_unref(&base);
740                printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
741                       (unsigned long)handle);
742                return -EINVAL;
743        }
744
745        vmw_user_bo = container_of(base, struct vmw_user_dma_buffer,
746                                   prime.base);
747        (void)ttm_bo_reference(&vmw_user_bo->dma.base);
748        ttm_base_object_unref(&base);
749        *out = &vmw_user_bo->dma;
750
751        return 0;
752}
753
754int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
755                              struct vmw_dma_buffer *dma_buf,
756                              uint32_t *handle)
757{
758        struct vmw_user_dma_buffer *user_bo;
759
760        if (dma_buf->base.destroy != vmw_user_dmabuf_destroy)
761                return -EINVAL;
762
763        user_bo = container_of(dma_buf, struct vmw_user_dma_buffer, dma);
764
765        *handle = user_bo->prime.base.hash.key;
766        return ttm_ref_object_add(tfile, &user_bo->prime.base,
767                                  TTM_REF_USAGE, NULL, false);
768}
769
770/*
771 * Stream management
772 */
773
774static void vmw_stream_destroy(struct vmw_resource *res)
775{
776        struct vmw_private *dev_priv = res->dev_priv;
777        struct vmw_stream *stream;
778        int ret;
779
780        DRM_INFO("%s: unref\n", __func__);
781        stream = container_of(res, struct vmw_stream, res);
782
783        ret = vmw_overlay_unref(dev_priv, stream->stream_id);
784        WARN_ON(ret != 0);
785}
786
787static int vmw_stream_init(struct vmw_private *dev_priv,
788                           struct vmw_stream *stream,
789                           void (*res_free) (struct vmw_resource *res))
790{
791        struct vmw_resource *res = &stream->res;
792        int ret;
793
794        ret = vmw_resource_init(dev_priv, res, false, res_free,
795                                &vmw_stream_func);
796
797        if (unlikely(ret != 0)) {
798                if (res_free == NULL)
799                        kfree(stream);
800                else
801                        res_free(&stream->res);
802                return ret;
803        }
804
805        ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
806        if (ret) {
807                vmw_resource_unreference(&res);
808                return ret;
809        }
810
811        DRM_INFO("%s: claimed\n", __func__);
812
813        vmw_resource_activate(&stream->res, vmw_stream_destroy);
814        return 0;
815}
816
817static void vmw_user_stream_free(struct vmw_resource *res)
818{
819        struct vmw_user_stream *stream =
820            container_of(res, struct vmw_user_stream, stream.res);
821        struct vmw_private *dev_priv = res->dev_priv;
822
823        ttm_base_object_kfree(stream, base);
824        ttm_mem_global_free(vmw_mem_glob(dev_priv),
825                            vmw_user_stream_size);
826}
827
828/**
829 * This function is called when user space has no more references on the
830 * base object. It releases the base-object's reference on the resource object.
831 */
832
833static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
834{
835        struct ttm_base_object *base = *p_base;
836        struct vmw_user_stream *stream =
837            container_of(base, struct vmw_user_stream, base);
838        struct vmw_resource *res = &stream->stream.res;
839
840        *p_base = NULL;
841        vmw_resource_unreference(&res);
842}
843
844int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
845                           struct drm_file *file_priv)
846{
847        struct vmw_private *dev_priv = vmw_priv(dev);
848        struct vmw_resource *res;
849        struct vmw_user_stream *stream;
850        struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
851        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
852        struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
853        int ret = 0;
854
855
856        res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
857        if (unlikely(res == NULL))
858                return -EINVAL;
859
860        if (res->res_free != &vmw_user_stream_free) {
861                ret = -EINVAL;
862                goto out;
863        }
864
865        stream = container_of(res, struct vmw_user_stream, stream.res);
866        if (stream->base.tfile != tfile) {
867                ret = -EINVAL;
868                goto out;
869        }
870
871        ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
872out:
873        vmw_resource_unreference(&res);
874        return ret;
875}
876
877int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
878                           struct drm_file *file_priv)
879{
880        struct vmw_private *dev_priv = vmw_priv(dev);
881        struct vmw_user_stream *stream;
882        struct vmw_resource *res;
883        struct vmw_resource *tmp;
884        struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
885        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
886        int ret;
887
888        /*
889         * Approximate idr memory usage with 128 bytes. It will be limited
890         * by maximum number_of streams anyway?
891         */
892
893        if (unlikely(vmw_user_stream_size == 0))
894                vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
895
896        ret = ttm_read_lock(&dev_priv->reservation_sem, true);
897        if (unlikely(ret != 0))
898                return ret;
899
900        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
901                                   vmw_user_stream_size,
902                                   false, true);
903        if (unlikely(ret != 0)) {
904                if (ret != -ERESTARTSYS)
905                        DRM_ERROR("Out of graphics memory for stream"
906                                  " creation.\n");
907                goto out_unlock;
908        }
909
910
911        stream = kmalloc(sizeof(*stream), GFP_KERNEL);
912        if (unlikely(stream == NULL)) {
913                ttm_mem_global_free(vmw_mem_glob(dev_priv),
914                                    vmw_user_stream_size);
915                ret = -ENOMEM;
916                goto out_unlock;
917        }
918
919        res = &stream->stream.res;
920        stream->base.shareable = false;
921        stream->base.tfile = NULL;
922
923        /*
924         * From here on, the destructor takes over resource freeing.
925         */
926
927        ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
928        if (unlikely(ret != 0))
929                goto out_unlock;
930
931        tmp = vmw_resource_reference(res);
932        ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
933                                   &vmw_user_stream_base_release, NULL);
934
935        if (unlikely(ret != 0)) {
936                vmw_resource_unreference(&tmp);
937                goto out_err;
938        }
939
940        arg->stream_id = res->id;
941out_err:
942        vmw_resource_unreference(&res);
943out_unlock:
944        ttm_read_unlock(&dev_priv->reservation_sem);
945        return ret;
946}
947
948int vmw_user_stream_lookup(struct vmw_private *dev_priv,
949                           struct ttm_object_file *tfile,
950                           uint32_t *inout_id, struct vmw_resource **out)
951{
952        struct vmw_user_stream *stream;
953        struct vmw_resource *res;
954        int ret;
955
956        res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
957                                  *inout_id);
958        if (unlikely(res == NULL))
959                return -EINVAL;
960
961        if (res->res_free != &vmw_user_stream_free) {
962                ret = -EINVAL;
963                goto err_ref;
964        }
965
966        stream = container_of(res, struct vmw_user_stream, stream.res);
967        if (stream->base.tfile != tfile) {
968                ret = -EPERM;
969                goto err_ref;
970        }
971
972        *inout_id = stream->stream.stream_id;
973        *out = res;
974        return 0;
975err_ref:
976        vmw_resource_unreference(&res);
977        return ret;
978}
979
980
981/**
982 * vmw_dumb_create - Create a dumb kms buffer
983 *
984 * @file_priv: Pointer to a struct drm_file identifying the caller.
985 * @dev: Pointer to the drm device.
986 * @args: Pointer to a struct drm_mode_create_dumb structure
987 *
988 * This is a driver callback for the core drm create_dumb functionality.
989 * Note that this is very similar to the vmw_dmabuf_alloc ioctl, except
990 * that the arguments have a different format.
991 */
992int vmw_dumb_create(struct drm_file *file_priv,
993                    struct drm_device *dev,
994                    struct drm_mode_create_dumb *args)
995{
996        struct vmw_private *dev_priv = vmw_priv(dev);
997        struct vmw_dma_buffer *dma_buf;
998        int ret;
999
1000        args->pitch = args->width * ((args->bpp + 7) / 8);
1001        args->size = args->pitch * args->height;
1002
1003        ret = ttm_read_lock(&dev_priv->reservation_sem, true);
1004        if (unlikely(ret != 0))
1005                return ret;
1006
1007        ret = vmw_user_dmabuf_alloc(dev_priv, vmw_fpriv(file_priv)->tfile,
1008                                    args->size, false, &args->handle,
1009                                    &dma_buf);
1010        if (unlikely(ret != 0))
1011                goto out_no_dmabuf;
1012
1013        vmw_dmabuf_unreference(&dma_buf);
1014out_no_dmabuf:
1015        ttm_read_unlock(&dev_priv->reservation_sem);
1016        return ret;
1017}
1018
1019/**
1020 * vmw_dumb_map_offset - Return the address space offset of a dumb buffer
1021 *
1022 * @file_priv: Pointer to a struct drm_file identifying the caller.
1023 * @dev: Pointer to the drm device.
1024 * @handle: Handle identifying the dumb buffer.
1025 * @offset: The address space offset returned.
1026 *
1027 * This is a driver callback for the core drm dumb_map_offset functionality.
1028 */
1029int vmw_dumb_map_offset(struct drm_file *file_priv,
1030                        struct drm_device *dev, uint32_t handle,
1031                        uint64_t *offset)
1032{
1033        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
1034        struct vmw_dma_buffer *out_buf;
1035        int ret;
1036
1037        ret = vmw_user_dmabuf_lookup(tfile, handle, &out_buf);
1038        if (ret != 0)
1039                return -EINVAL;
1040
1041        *offset = drm_vma_node_offset_addr(&out_buf->base.vma_node);
1042        vmw_dmabuf_unreference(&out_buf);
1043        return 0;
1044}
1045
1046/**
1047 * vmw_dumb_destroy - Destroy a dumb boffer
1048 *
1049 * @file_priv: Pointer to a struct drm_file identifying the caller.
1050 * @dev: Pointer to the drm device.
1051 * @handle: Handle identifying the dumb buffer.
1052 *
1053 * This is a driver callback for the core drm dumb_destroy functionality.
1054 */
1055int vmw_dumb_destroy(struct drm_file *file_priv,
1056                     struct drm_device *dev,
1057                     uint32_t handle)
1058{
1059        return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
1060                                         handle, TTM_REF_USAGE);
1061}
1062
1063/**
1064 * vmw_resource_buf_alloc - Allocate a backup buffer for a resource.
1065 *
1066 * @res:            The resource for which to allocate a backup buffer.
1067 * @interruptible:  Whether any sleeps during allocation should be
1068 *                  performed while interruptible.
1069 */
1070static int vmw_resource_buf_alloc(struct vmw_resource *res,
1071                                  bool interruptible)
1072{
1073        unsigned long size =
1074                (res->backup_size + PAGE_SIZE - 1) & PAGE_MASK;
1075        struct vmw_dma_buffer *backup;
1076        int ret;
1077
1078        if (likely(res->backup)) {
1079                BUG_ON(res->backup->base.num_pages * PAGE_SIZE < size);
1080                return 0;
1081        }
1082
1083        backup = kzalloc(sizeof(*backup), GFP_KERNEL);
1084        if (unlikely(backup == NULL))
1085                return -ENOMEM;
1086
1087        ret = vmw_dmabuf_init(res->dev_priv, backup, res->backup_size,
1088                              res->func->backup_placement,
1089                              interruptible,
1090                              &vmw_dmabuf_bo_free);
1091        if (unlikely(ret != 0))
1092                goto out_no_dmabuf;
1093
1094        res->backup = backup;
1095
1096out_no_dmabuf:
1097        return ret;
1098}
1099
1100/**
1101 * vmw_resource_do_validate - Make a resource up-to-date and visible
1102 *                            to the device.
1103 *
1104 * @res:            The resource to make visible to the device.
1105 * @val_buf:        Information about a buffer possibly
1106 *                  containing backup data if a bind operation is needed.
1107 *
1108 * On hardware resource shortage, this function returns -EBUSY and
1109 * should be retried once resources have been freed up.
1110 */
1111static int vmw_resource_do_validate(struct vmw_resource *res,
1112                                    struct ttm_validate_buffer *val_buf)
1113{
1114        int ret = 0;
1115        const struct vmw_res_func *func = res->func;
1116
1117        if (unlikely(res->id == -1)) {
1118                ret = func->create(res);
1119                if (unlikely(ret != 0))
1120                        return ret;
1121        }
1122
1123        if (func->bind &&
1124            ((func->needs_backup && list_empty(&res->mob_head) &&
1125              val_buf->bo != NULL) ||
1126             (!func->needs_backup && val_buf->bo != NULL))) {
1127                ret = func->bind(res, val_buf);
1128                if (unlikely(ret != 0))
1129                        goto out_bind_failed;
1130                if (func->needs_backup)
1131                        list_add_tail(&res->mob_head, &res->backup->res_list);
1132        }
1133
1134        /*
1135         * Only do this on write operations, and move to
1136         * vmw_resource_unreserve if it can be called after
1137         * backup buffers have been unreserved. Otherwise
1138         * sort out locking.
1139         */
1140        res->res_dirty = true;
1141
1142        return 0;
1143
1144out_bind_failed:
1145        func->destroy(res);
1146
1147        return ret;
1148}
1149
1150/**
1151 * vmw_resource_unreserve - Unreserve a resource previously reserved for
1152 * command submission.
1153 *
1154 * @res:               Pointer to the struct vmw_resource to unreserve.
1155 * @new_backup:        Pointer to new backup buffer if command submission
1156 *                     switched.
1157 * @new_backup_offset: New backup offset if @new_backup is !NULL.
1158 *
1159 * Currently unreserving a resource means putting it back on the device's
1160 * resource lru list, so that it can be evicted if necessary.
1161 */
1162void vmw_resource_unreserve(struct vmw_resource *res,
1163                            struct vmw_dma_buffer *new_backup,
1164                            unsigned long new_backup_offset)
1165{
1166        struct vmw_private *dev_priv = res->dev_priv;
1167
1168        if (!list_empty(&res->lru_head))
1169                return;
1170
1171        if (new_backup && new_backup != res->backup) {
1172
1173                if (res->backup) {
1174                        lockdep_assert_held(&res->backup->base.resv->lock.base);
1175                        list_del_init(&res->mob_head);
1176                        vmw_dmabuf_unreference(&res->backup);
1177                }
1178
1179                res->backup = vmw_dmabuf_reference(new_backup);
1180                lockdep_assert_held(&new_backup->base.resv->lock.base);
1181                list_add_tail(&res->mob_head, &new_backup->res_list);
1182        }
1183        if (new_backup)
1184                res->backup_offset = new_backup_offset;
1185
1186        if (!res->func->may_evict || res->id == -1)
1187                return;
1188
1189        write_lock(&dev_priv->resource_lock);
1190        list_add_tail(&res->lru_head,
1191                      &res->dev_priv->res_lru[res->func->res_type]);
1192        write_unlock(&dev_priv->resource_lock);
1193}
1194
1195/**
1196 * vmw_resource_check_buffer - Check whether a backup buffer is needed
1197 *                             for a resource and in that case, allocate
1198 *                             one, reserve and validate it.
1199 *
1200 * @res:            The resource for which to allocate a backup buffer.
1201 * @interruptible:  Whether any sleeps during allocation should be
1202 *                  performed while interruptible.
1203 * @val_buf:        On successful return contains data about the
1204 *                  reserved and validated backup buffer.
1205 */
1206static int
1207vmw_resource_check_buffer(struct vmw_resource *res,
1208                          bool interruptible,
1209                          struct ttm_validate_buffer *val_buf)
1210{
1211        struct list_head val_list;
1212        bool backup_dirty = false;
1213        int ret;
1214
1215        if (unlikely(res->backup == NULL)) {
1216                ret = vmw_resource_buf_alloc(res, interruptible);
1217                if (unlikely(ret != 0))
1218                        return ret;
1219        }
1220
1221        INIT_LIST_HEAD(&val_list);
1222        val_buf->bo = ttm_bo_reference(&res->backup->base);
1223        val_buf->shared = false;
1224        list_add_tail(&val_buf->head, &val_list);
1225        ret = ttm_eu_reserve_buffers(NULL, &val_list, interruptible);
1226        if (unlikely(ret != 0))
1227                goto out_no_reserve;
1228
1229        if (res->func->needs_backup && list_empty(&res->mob_head))
1230                return 0;
1231
1232        backup_dirty = res->backup_dirty;
1233        ret = ttm_bo_validate(&res->backup->base,
1234                              res->func->backup_placement,
1235                              true, false);
1236
1237        if (unlikely(ret != 0))
1238                goto out_no_validate;
1239
1240        return 0;
1241
1242out_no_validate:
1243        ttm_eu_backoff_reservation(NULL, &val_list);
1244out_no_reserve:
1245        ttm_bo_unref(&val_buf->bo);
1246        if (backup_dirty)
1247                vmw_dmabuf_unreference(&res->backup);
1248
1249        return ret;
1250}
1251
1252/**
1253 * vmw_resource_reserve - Reserve a resource for command submission
1254 *
1255 * @res:            The resource to reserve.
1256 *
1257 * This function takes the resource off the LRU list and make sure
1258 * a backup buffer is present for guest-backed resources. However,
1259 * the buffer may not be bound to the resource at this point.
1260 *
1261 */
1262int vmw_resource_reserve(struct vmw_resource *res, bool no_backup)
1263{
1264        struct vmw_private *dev_priv = res->dev_priv;
1265        int ret;
1266
1267        write_lock(&dev_priv->resource_lock);
1268        list_del_init(&res->lru_head);
1269        write_unlock(&dev_priv->resource_lock);
1270
1271        if (res->func->needs_backup && res->backup == NULL &&
1272            !no_backup) {
1273                ret = vmw_resource_buf_alloc(res, true);
1274                if (unlikely(ret != 0))
1275                        return ret;
1276        }
1277
1278        return 0;
1279}
1280
1281/**
1282 * vmw_resource_backoff_reservation - Unreserve and unreference a
1283 *                                    backup buffer
1284 *.
1285 * @val_buf:        Backup buffer information.
1286 */
1287static void
1288vmw_resource_backoff_reservation(struct ttm_validate_buffer *val_buf)
1289{
1290        struct list_head val_list;
1291
1292        if (likely(val_buf->bo == NULL))
1293                return;
1294
1295        INIT_LIST_HEAD(&val_list);
1296        list_add_tail(&val_buf->head, &val_list);
1297        ttm_eu_backoff_reservation(NULL, &val_list);
1298        ttm_bo_unref(&val_buf->bo);
1299}
1300
1301/**
1302 * vmw_resource_do_evict - Evict a resource, and transfer its data
1303 *                         to a backup buffer.
1304 *
1305 * @res:            The resource to evict.
1306 * @interruptible:  Whether to wait interruptible.
1307 */
1308int vmw_resource_do_evict(struct vmw_resource *res, bool interruptible)
1309{
1310        struct ttm_validate_buffer val_buf;
1311        const struct vmw_res_func *func = res->func;
1312        int ret;
1313
1314        BUG_ON(!func->may_evict);
1315
1316        val_buf.bo = NULL;
1317        val_buf.shared = false;
1318        ret = vmw_resource_check_buffer(res, interruptible, &val_buf);
1319        if (unlikely(ret != 0))
1320                return ret;
1321
1322        if (unlikely(func->unbind != NULL &&
1323                     (!func->needs_backup || !list_empty(&res->mob_head)))) {
1324                ret = func->unbind(res, res->res_dirty, &val_buf);
1325                if (unlikely(ret != 0))
1326                        goto out_no_unbind;
1327                list_del_init(&res->mob_head);
1328        }
1329        ret = func->destroy(res);
1330        res->backup_dirty = true;
1331        res->res_dirty = false;
1332out_no_unbind:
1333        vmw_resource_backoff_reservation(&val_buf);
1334
1335        return ret;
1336}
1337
1338
1339/**
1340 * vmw_resource_validate - Make a resource up-to-date and visible
1341 *                         to the device.
1342 *
1343 * @res:            The resource to make visible to the device.
1344 *
1345 * On succesful return, any backup DMA buffer pointed to by @res->backup will
1346 * be reserved and validated.
1347 * On hardware resource shortage, this function will repeatedly evict
1348 * resources of the same type until the validation succeeds.
1349 */
1350int vmw_resource_validate(struct vmw_resource *res)
1351{
1352        int ret;
1353        struct vmw_resource *evict_res;
1354        struct vmw_private *dev_priv = res->dev_priv;
1355        struct list_head *lru_list = &dev_priv->res_lru[res->func->res_type];
1356        struct ttm_validate_buffer val_buf;
1357        unsigned err_count = 0;
1358
1359        if (likely(!res->func->may_evict))
1360                return 0;
1361
1362        val_buf.bo = NULL;
1363        val_buf.shared = false;
1364        if (res->backup)
1365                val_buf.bo = &res->backup->base;
1366        do {
1367                ret = vmw_resource_do_validate(res, &val_buf);
1368                if (likely(ret != -EBUSY))
1369                        break;
1370
1371                write_lock(&dev_priv->resource_lock);
1372                if (list_empty(lru_list) || !res->func->may_evict) {
1373                        DRM_ERROR("Out of device device resources "
1374                                  "for %s.\n", res->func->type_name);
1375                        ret = -EBUSY;
1376                        write_unlock(&dev_priv->resource_lock);
1377                        break;
1378                }
1379
1380                evict_res = vmw_resource_reference
1381                        (list_first_entry(lru_list, struct vmw_resource,
1382                                          lru_head));
1383                list_del_init(&evict_res->lru_head);
1384
1385                write_unlock(&dev_priv->resource_lock);
1386
1387                ret = vmw_resource_do_evict(evict_res, true);
1388                if (unlikely(ret != 0)) {
1389                        write_lock(&dev_priv->resource_lock);
1390                        list_add_tail(&evict_res->lru_head, lru_list);
1391                        write_unlock(&dev_priv->resource_lock);
1392                        if (ret == -ERESTARTSYS ||
1393                            ++err_count > VMW_RES_EVICT_ERR_COUNT) {
1394                                vmw_resource_unreference(&evict_res);
1395                                goto out_no_validate;
1396                        }
1397                }
1398
1399                vmw_resource_unreference(&evict_res);
1400        } while (1);
1401
1402        if (unlikely(ret != 0))
1403                goto out_no_validate;
1404        else if (!res->func->needs_backup && res->backup) {
1405                list_del_init(&res->mob_head);
1406                vmw_dmabuf_unreference(&res->backup);
1407        }
1408
1409        return 0;
1410
1411out_no_validate:
1412        return ret;
1413}
1414
1415/**
1416 * vmw_fence_single_bo - Utility function to fence a single TTM buffer
1417 *                       object without unreserving it.
1418 *
1419 * @bo:             Pointer to the struct ttm_buffer_object to fence.
1420 * @fence:          Pointer to the fence. If NULL, this function will
1421 *                  insert a fence into the command stream..
1422 *
1423 * Contrary to the ttm_eu version of this function, it takes only
1424 * a single buffer object instead of a list, and it also doesn't
1425 * unreserve the buffer object, which needs to be done separately.
1426 */
1427void vmw_fence_single_bo(struct ttm_buffer_object *bo,
1428                         struct vmw_fence_obj *fence)
1429{
1430        struct ttm_bo_device *bdev = bo->bdev;
1431
1432        struct vmw_private *dev_priv =
1433                container_of(bdev, struct vmw_private, bdev);
1434
1435        if (fence == NULL) {
1436                vmw_execbuf_fence_commands(NULL, dev_priv, &fence, NULL);
1437                reservation_object_add_excl_fence(bo->resv, &fence->base);
1438                fence_put(&fence->base);
1439        } else
1440                reservation_object_add_excl_fence(bo->resv, &fence->base);
1441}
1442
1443/**
1444 * vmw_resource_move_notify - TTM move_notify_callback
1445 *
1446 * @bo:             The TTM buffer object about to move.
1447 * @mem:            The truct ttm_mem_reg indicating to what memory
1448 *                  region the move is taking place.
1449 *
1450 * Evicts the Guest Backed hardware resource if the backup
1451 * buffer is being moved out of MOB memory.
1452 * Note that this function should not race with the resource
1453 * validation code as long as it accesses only members of struct
1454 * resource that remain static while bo::res is !NULL and
1455 * while we have @bo reserved. struct resource::backup is *not* a
1456 * static member. The resource validation code will take care
1457 * to set @bo::res to NULL, while having @bo reserved when the
1458 * buffer is no longer bound to the resource, so @bo:res can be
1459 * used to determine whether there is a need to unbind and whether
1460 * it is safe to unbind.
1461 */
1462void vmw_resource_move_notify(struct ttm_buffer_object *bo,
1463                              struct ttm_mem_reg *mem)
1464{
1465        struct vmw_dma_buffer *dma_buf;
1466
1467        if (mem == NULL)
1468                return;
1469
1470        if (bo->destroy != vmw_dmabuf_bo_free &&
1471            bo->destroy != vmw_user_dmabuf_destroy)
1472                return;
1473
1474        dma_buf = container_of(bo, struct vmw_dma_buffer, base);
1475
1476        if (mem->mem_type != VMW_PL_MOB) {
1477                struct vmw_resource *res, *n;
1478                struct ttm_validate_buffer val_buf;
1479
1480                val_buf.bo = bo;
1481                val_buf.shared = false;
1482
1483                list_for_each_entry_safe(res, n, &dma_buf->res_list, mob_head) {
1484
1485                        if (unlikely(res->func->unbind == NULL))
1486                                continue;
1487
1488                        (void) res->func->unbind(res, true, &val_buf);
1489                        res->backup_dirty = true;
1490                        res->res_dirty = false;
1491                        list_del_init(&res->mob_head);
1492                }
1493
1494                (void) ttm_bo_wait(bo, false, false, false);
1495        }
1496}
1497
1498/**
1499 * vmw_resource_needs_backup - Return whether a resource needs a backup buffer.
1500 *
1501 * @res:            The resource being queried.
1502 */
1503bool vmw_resource_needs_backup(const struct vmw_resource *res)
1504{
1505        return res->func->needs_backup;
1506}
1507
1508/**
1509 * vmw_resource_evict_type - Evict all resources of a specific type
1510 *
1511 * @dev_priv:       Pointer to a device private struct
1512 * @type:           The resource type to evict
1513 *
1514 * To avoid thrashing starvation or as part of the hibernation sequence,
1515 * try to evict all evictable resources of a specific type.
1516 */
1517static void vmw_resource_evict_type(struct vmw_private *dev_priv,
1518                                    enum vmw_res_type type)
1519{
1520        struct list_head *lru_list = &dev_priv->res_lru[type];
1521        struct vmw_resource *evict_res;
1522        unsigned err_count = 0;
1523        int ret;
1524
1525        do {
1526                write_lock(&dev_priv->resource_lock);
1527
1528                if (list_empty(lru_list))
1529                        goto out_unlock;
1530
1531                evict_res = vmw_resource_reference(
1532                        list_first_entry(lru_list, struct vmw_resource,
1533                                         lru_head));
1534                list_del_init(&evict_res->lru_head);
1535                write_unlock(&dev_priv->resource_lock);
1536
1537                ret = vmw_resource_do_evict(evict_res, false);
1538                if (unlikely(ret != 0)) {
1539                        write_lock(&dev_priv->resource_lock);
1540                        list_add_tail(&evict_res->lru_head, lru_list);
1541                        write_unlock(&dev_priv->resource_lock);
1542                        if (++err_count > VMW_RES_EVICT_ERR_COUNT) {
1543                                vmw_resource_unreference(&evict_res);
1544                                return;
1545                        }
1546                }
1547
1548                vmw_resource_unreference(&evict_res);
1549        } while (1);
1550
1551out_unlock:
1552        write_unlock(&dev_priv->resource_lock);
1553}
1554
1555/**
1556 * vmw_resource_evict_all - Evict all evictable resources
1557 *
1558 * @dev_priv:       Pointer to a device private struct
1559 *
1560 * To avoid thrashing starvation or as part of the hibernation sequence,
1561 * evict all evictable resources. In particular this means that all
1562 * guest-backed resources that are registered with the device are
1563 * evicted and the OTable becomes clean.
1564 */
1565void vmw_resource_evict_all(struct vmw_private *dev_priv)
1566{
1567        enum vmw_res_type type;
1568
1569        mutex_lock(&dev_priv->cmdbuf_mutex);
1570
1571        for (type = 0; type < vmw_res_max; ++type)
1572                vmw_resource_evict_type(dev_priv, type);
1573
1574        mutex_unlock(&dev_priv->cmdbuf_mutex);
1575}
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